Steam-boiler tube



No ModeL) S. STB0N.

STBM BoILBB TUBBl Nol 266,220.

Patented ootl 17. 1882.

v N STATES ATENT FICEe STEAM-BoILER TUBE.

sPoIoAoN forInin art of Ietters ,atent 1To. 266,220, dated october 17,1882.

oppHootion f1o1 Maroh 6. 1882. (No modol Be if known that I, GEOBGE S.SBoNG, aJ oitizon of the TDited StateS, ond o feSidentof PhadelphiaPennSylvanio, hve invented an IInproveDont in Steom-BoeT TubeS, of Whiohthe foHowing is o Spooioation.

Iy invention TelofeS to an improveInent in the oprighf topering tobeS ofStean]-bonerS nd io oonSiStS in rednoing an ordinory o lindrioallapwelded tube to the deSired tapering shape by oorrugating oI'orimpingitin the peonlior manner fuy desoribed hereinofter, the tubethuS oonStruoted being oheaper nd a bettef tronSmittor of heof andpreSentin II1ofe leating-surfaoo than an ordioary ta er fube.

In the aoooTnpanying draWings, l igure 1 TepfesentS aJ Side vieW of aJoylindrioal laI)- Tvel(Ied tube, preferobly of steel, and bont twelveinoheS in dimeter I igS.2 and3, views of the Same tube, Showing thesucoessivo degreeS of toper impartodo it ig. vieW of tho tnbe in itSniShed oondition. he above vieWS are drowu to a SoaIe of one iooh tofoof, 1 `igS. 5, 6, and 7, Whioh ore drown to a Soale of Six inoheS tofoot, Show the dierenf oondifions of the corrugtionS af the lowef end ofthe fobe in the difforent stageS of itS redootion to tho deSiredtopering forIn; ig. 8, Which iS alSo drown toa soale of Six inoheS to ofoot, showS the lOWer end of the taper tube in itS niShed oondition. ig-9 iS aJ porfion of a boi]er drown to rednoed Soalo, and showing thotapefing tobeS; and Eig.10, dio gfoIn iHoSfTating tho II]ode in Whioh Iprefer to mko the tnbeS.

he uprighb fapering tubes, larger abovo thon below, of the Style ofsfeaIn-bonofknown aS the GaHoWo ,ore aoknow]ed ed b engineefs to po SeSSSeveroI advanoageS over oy lindfioal veftioo1 tnbeS, tho onl objeotionto then being theif expenSe S hefetofore made thof iS, b outting ont oSheet of plate ifon of appropriate form, lapping the edgeS, and Weldingthe lap by hand WhHo the tube is heM on a tapering InondreL he outtingof the plote to waSte, the fedionS operation of Welding b hond, and theneoesSity of employing thiok )lote-iron in order to effeot o propervvelding, aH oontribnte to ronder ordinary tnbes of thiS olaSSexpensive.

In oarI'ying out IDy invention I toke aJ o 1in driool lap-Welded tobe,ig. 1 of the Te quired length, and rednoe it to the deSired taperingforIn by tapering oorru ations. TheSe oorrugationS I prefor fo oakegfduaH v, or by oS Inony SoooeSSive operationS as the dimeter of thetube nd o[her oiroumSfanoeS Inay rouire. huS the taper ShowU in i 2 isobtained b oorrugoting the fobe, oS ShoWo io Fig. 5, Whioh iuS[rateS theoondition of the oorrugotionS at the extreme loWer end of the SHid tube,the grooves formed in the exterior of Wbioh are fperig, or, inothorWordS, grad uaH deoreaso in depth from the lower end of the tubeontH they fiI1L1y diSappear of ,ig. 2, for a portion of the nppef end oftho tube abovo the Sid ine Should Tebin itS oylindrioal form f or ourpoSe rendered appreHf hereinafter. The ribS formed by the ooffugationS re proninenb below, buf beoome gradoaHy leSs pro]1inenf until theyn1erge into the oylindriol portion of bhe tobe of oo. Inoro obrupt toperiS imported to the tube by Tedooing the oofrugtionS af the lowef end ofthe Said tubo to the oondioion shoWn in Eig. 6, the oorrugtionS beingStill Inade on a taper and n1ergin into the oylindriool portion of thotube by thiS Seoond opefatiOD aSSuming the forn, I ig. 3, in Whioh,hoWever, I hove ShOWn o lines indioting oorrugotionS, fo tho rea- Sonthat, if propefly Inado, the 7 Wonld be too Inuoh ofowded. By the thirdoperation the foldS nade by tho oorfogationS are ooInpaoted aS Shown inig. 7, nd o sti11 nore abrup taper iS imporfed to the tobe, theoorrugafionS being StiH on J taper ond Inerging iofo tho upperoylindriool portion of tho tube. Dhe fino1 operotion iS .to pTeparo thetubo fof aJt taohmentto tho boiler. This WiH depend opon the mode dopfedof foSteniog the tube. In the pfeSent inStanoe the upper o lindriool poftion of the tube iS forged into a flaIge, for oftaohment to obranoh onfhe nppefhorizontal poftion of tho boiler, While at the lovver end ofthe tnbe tho oofrugationS aTe Welded toether, aS ShOWn in i 8, So as toi,orm o short tube, o, of SoHd lnefal, into whioh the Tibs forIIed bythe oorfugotionS Dergel vVhile in [noSf ooSeS the SuooeSSive oper tionSdesoribed m be adviSoble, in somo in Ico SfaJnoos tho desirod toper Inaybe in]pafted b one oorrugating operotion, or 1ofe thn three SuooesSiveoperafionS lI1ay be reSofbed to.

vhile my impfoved tpef tnbeS, When form-

